Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ffae18f1a3f331…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 03:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b251fe6b149e5fa97212524c5457d382 SHA-1: 0f4599213a7ada6e80c549e1bdd6d693c495b941 SHA-256: 14ffae18f1a3f331cf2f9bf09e2f443165880aeb76c3d294254f04dd516fe4d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous links pointing to compromised websites, likely to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The presence of a download button lure further supports the phishing pretext. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6669592e---54077283644.pdf In PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/vitelesirixipif.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/kaxefupawilasa.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/93616374279.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/vumoripujonurutonimem.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16091752e50aa1---59973480881.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1345c4544---12835300325.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/topujeserajedovozabosi.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sonej.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/bamasezakofajunajekafizup.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/le7is32bmduvriqvo569mdo54a/28036023712.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ffd9a3ad---sugowipiwodilasaruzoj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959db2ec656---43976733073.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vasavibipuvesuvurepafitop.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/seriniwedenagani.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/u8p740cd9q7c49e01uam90m98b/fafovek.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/xozaluzebaf.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c567805efd5---biwozop.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777f804bb65---gotekopovajom.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/savro3fso9kjn0vn9f6odo64v2/37747594585.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e6aa353ddc81705cec35a2f368583730/71084728230.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072929e8059a---jozeboxawil.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7419db0143---vafinopoxunariv.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/nuxivi.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/lokojuzotod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dibrugarh+university+exam+routine+2018+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 18348 bytes
SHA-256: 9a482d1be33c1dfc22ea3881d5ea34abd8d8e95fcaab7ab092a1f446b6865ca5
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 12056 bytes
SHA-256: 4876a2f02e2a075e4018ceeec0120543f5a360bf846c2ee838e2050a59be1f55